The duck-billed platypus and other monotremes differ from other mammals in that they
A) are aquatic.
B) lay eggs.
C) have mammary glands.
D) have hair.
Answer: B
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Which of the following is true in the fern life cycle?
a. Gametophytes originate within and are dependent upon sporophytes b. Sporophytes originate within and are dependent upon gametophytes c. Both gametophytes and sporophytes are totally independent from each other and are equally dominant d. Gametophytes are free-living and photosynthetic, but are replaced by a dominant sporophyte generation e. Gametophytes are photosynthetic and partially independent from the sporophytes
Which of the following definitions is
CORRECT?
a. A community refers to interaction between populations and their environment. b. A community refers to interaction between species and their environment. c. A community refers to the area in which different species live. d. A community refers to all species that live and interact in a specific area. e. None of these are correct
Scientific evidences suggest that oxygen gas
appeared on earth about ____ years ago.
a. 38,000,000,000 b. 25,000,000,000 c. 2,300,000,000 d. 380,000,000 e. 4,500,000
A ________ person has the highest energy expenditure at rest
A) moderately sedentary B) very sedentary, overweight C) very physically active, muscular D) moderately physically active